as i know that html has static tag, i want to create own tag in html.

I create my own tags all the time.

<nonsensical question>
     as i know that html has static tag, i want to create own tag in html.
</nonsensical question>

And how would a web browser know what to do with your tag or what it means?

It will simply be ignored!

it was a joke, dude.

I am not sure that you can do your own tags in HTML. I believe it would have to be recognized on the server to do that.

But if someone knows how please explain.

What has the SERVER got to do with it???

HTML is rendered by BROWSERS!!

You can create your own XML element. An element is made up of a starting and ending tag. Is that what you meant?